xrdp is an open source RDP server. xrdp versions prior to 0.10.0 have a vulnerability that allows attackers to make an infinite number of login attempts. The number of max login attempts is supposed to be limited by a configuration parameter `MaxLoginRetry` in `/etc/xrdp/sesman.ini`. However, this mechanism was not effectively working. As a result, xrdp allows an infinite number of login attempts.
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-7w22-h4w7-8j5j
https://github.com/neutrinolabs/xrdp/commit/19c111c74c913ecc6e4ba9a738ed929a79d2ae8f